When the BOREN bits of Configuration Words are programmed to
‘01’, the BOR is controlled by the SBOREN
bit. The device start-up is not delayed by the BOR Ready condition or the VDD
level.
BOR protection begins as soon as the BOR circuit is ready. The status of the BOR circuit is reflected in the BORRDY bit.
BOR protection is unchanged by Sleep.
| BOREN | SBOREN | Device Mode | BOR Mode | Instruction Execution upon: | |
|---|---|---|---|---|---|
| Release of POR | Wake-up from Sleep | ||||
11(1) |
X |
X | Active | Wait for release of BOR (BORRDY = 1) |
Begins immediately |
10 |
X |
Awake | Active | Wait for release of BOR (BORRDY = 1) |
N/A |
| Sleep | Hibernate | N/A | Wait for release of BOR (BORRDY = 1) |
||
01 |
1 |
X | Active | Wait for release of BOR (BORRDY =
1) |
Begins immediately |
0 |
X | Hibernate | |||
00 |
X |
X | Disabled | Begins immediately | |
Note:
- 1.In this specific case, ‘Release of
POR’ and ‘Wake-up from Sleep’, there is no delay in start-up. The BOR Ready flag
(BORRDY =
1) will be set before the CPU is ready to execute instructions because the BOR circuit is forced on by the BOREN bits.
Figure 1. Brown-Out Situations
Note: TPWRT delay when the
PWRTS bits are enabled (PWRTS !=
00).